theres some great answers to some of those questions from Chris here:

Canon Reveals Their Next Pro Video Cam at DVInfo.net

Manuel,

IMO the 7D looks significanly better if you can avoid the aliasing and if you nail the focus. With a lot of light, the A1 is still quite impressive if you don't require shallow DOF. I'm shooting a stage performance the next two nights without having seen the rehearsals and I'll be using 3 A1's. Can't risk the 7D on live content and don't want to mix the footage since it will be low light and the A1 and 7D will look very different in this environment. With a little noise reduction the A1's will do fine.

I look forward to the Aqueduct footage.

550d
 

Now that this is kinda topical... I bought a 7d because of the framerates and because i dont need tighter than super35 for DOF.

Now that the 550d is announced? I'll be selling the 7d and buying two of those.

heh. For the price of a 5d you could have what, 4 550d? Just give one to everybody on set and have total coverage.

heh.